how long the cached information is assumed to be valid. We need to revalidate the cached attrs for this inode if jiffies - read_cache_jiffies > attrtimeo.

the first byte after end address within vm_mm

the address of buf in user space

parent dir name

device identifier

when we started read-caching this inode

vm flags

inode number

start address within vm_mm

file name

cache related bit mask flag